Almost all of us, watched 'Jab Tak Hai Jaan'...The message of this movie can be described with 'Newton's Laws of Motion', which almost all of us read in school level physics...Let me explain !!

First Law:

"If an object experiences no net force, then its velocity is constant: the object is either at rest (if its velocity is zero), or it moves in a straight line with constant speed"....In the movie, its shown that, Samar's life (object) almost came to a standstill (at rest), after his break-up with Meera... Afterwards, when Akira (net force) rekindled the lost love in Samar's heart through some incidents, he again started to relive (moving in a straight line with constant speed)...

Second Law:

"The acceleration of a body is parallel and directly proportional to the net force acting on the body, is in the direction of the net force, and is inversely proportional to the mass of the body"...Love always comes accompanied by ebullience + torment... Hope + Hopelessness... Light + darkness... Love gets fulfilled when its mutual (as seen in Samar-Meera).. But when its one-sided (in case of Akira), then despair automatically knocks at the door...But, if we truly love the very basic essence of 'life', then the 'momentum' of love can't be stopped...No other external force can impose a barrier to the acceleration of life if the wheel of vivacity is driven by the internal force called 'love'...

Third Law:

"When a first body exerts a force on a second body, the second body simultaneously exerts a force on the first body"...In this film aka in 'reel life' it was shown that, Meera fell in love with Samar despite their huge socio-economical differences...In 'real-life' too, love can create wonders!! All of us, have our specific requirements / fantasies / expectations regarding our 'special person/lover'...If someone loves us & we don't find our individualistic requirements in that particular person, then we don't reciprocate to his/her feelings in the same way...But, if you truly love a person & decent enough in your approach towards him/her, then, there is a good probability that, your beloved ones will surely respect your attitude & appreciate you for what you are & afterwards, if the cupid strikes, then, this 'liking' can turn out to be 'love' as well...

P.S. This is a light take on the theory of Romance...Cannot guarantee about its practical implementation :-)